Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ba303018bcba2a…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 23:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5793cf058ebd7eba0f221e2b1b3f2328 SHA-1: 51cbb9af9e83a7ec09d933a689bb457cf63666ab SHA-256: 66ba303018bcba2a26c50854c6d0fa942a38d9a95c065bd219e927eb2fcc49a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.anclupnapoli.it/userfiles/file/67486159837.pdf In PDF document text
    • https://vanvoorst.info/uploaded/file/tefudomokukiwixim.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tiwoketitesu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ji13ohbpvho9gao1306qnraoq7/gajixoxivogo.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c4b32c177762ee5e3aa66b8a8e1c49ad/tetakudokitosojamomomek.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/57969980379.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/gurugesaka.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/98166512342.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/25667050069.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/28275129176.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/14611404817.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/dosokuroj.pdfIn PDF document text
    • http://hongdacable.com/d/files/zitixusawenibezur.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i69dk1h09kuch3v7f7a7fouas6/xetenuxedirivanefebi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073203d19224---kibev.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/44d6d456fbd7a137fbf40b0102b3033f/sokukuditujarinovo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/62920521415.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/xerekejukorifipabezanaka.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/gowulonol.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/96ca53817664cea357d284a84b94bc3b/betixeboveram.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/bavofupimidiwejepureguz.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/19936855533.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/k8dffc6fs3jf6t3lnp7v2t3i43/498260268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lithium+ion+battery+technology+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 11208 bytes
SHA-256: 3fbdbfb96979897942b33bb65ed130476e937b36d1dcd3df2774d2ce90481710
font_01_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 18564 bytes
SHA-256: 92c5b5e7252a773d4821f9c6c8a014dda11db0ecfcf313bdf83d379b1b4717b5
font_02_sfnt_off000147c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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